What is the next step in muscle contraction after the actin changes shape?

A. An ATP molecule binds to the myosin.

B. Myosin and actin slide past each other.

C. A calcium ion binds to actin.

D. Myosin binds to actin.

What percentage of Earth's liquid surface freshwater is found in rivers? A) 0.9% B) 2% C) 11% D) 87%

A foreign molecule that causes a specific response by lymphocytes is called a (n) A) antibiotic. B) antibody. C) antigen. D) antiviral.

Which of the following is a true statement cellular respirstion occurs only in plant cells cellular respirstion occurs only on animals cells cellular respirstion occurs in both plant amd animal cells cellular respirstion occurs in some plant cells

A zoo or aquarium can only be accredited if: It meets standards for animal management and care. Animals are provided variety in their daily routine. The organization's veterinary program is well run. The zoo has good finances. all of the above

What is the natural pH of the ocean? below 7 above 7 exactly 7 different depending on the location

What event is there basis for cell communication?

What do the amino acids tyr, asn, and thr have in common?

What is a special type of motor designed to operate with the rotor stalled without damage to the motor?

Chemical substances that can alter arousal, mood, thinking, sensation, and perception are called:

Mendel mated plants that produced only round seeds and to those that produced only wrinkled seeds. in the next generation, all the pea plants produced only round seeds. which term describes how the round-seed allele is inherited? see section 14.